[url]http://i.kinja-img.com/gawker-media/image/upload/cu0orpip2q3er6xuert7.jpg[/url]
I remembered seeing this a while ago, and... well, there IS a Comet!
Most of teh Concept art for the game has made its way into the game, so this should too eventually.
As well as those other images we've yet to see in game.
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There's a comet or meteor in Mars' orbit. You can see it when selecting which planet you want to go to as well as you can see it on the horizon when on Mars. I assume that will play a role in the future.